Sand or strainer valve for filters.



No. 877,182. PATENTED JAN. 21, 1908.

- J. R. & H. D. ELFRETH.

SAND 0R STRAINER VALVE FOR FILTERS.

APPLICATION FILED JULY 9, 1907.

2 SHEETS-SHEET 1.

2mm oozes No. 877,182. PAT-ENTBD JAN. 21, 1908-.

- J. R. & H. D. ELFRETH.

SAND 0R STRAINBR VALVE FOR FILTERS.

. ArrLrcAmon FILED JULY 9. 1907.

2 SHEETS-SHEET 2.

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JACOB R. ELFRETH AND HAROLD D. ELFRETH, OF PHILADELPHIA, PENNSYLVANIA.

SAND OR STRAIN'ER VALVE FOR FILTERS.

Application filed July 9. 1907.

T 0 all whom it may concern:

Be it known that we, JACOB R. ELFRETH and HAROLD D. ELFRETH, bothcitizens of the United States, and residing in the city and county ofPhiladelphia, State of Pennsylvania, have invente a new and useful Sandor Strainer Valve for a Filter, of which the following is aspecification.

Our invention relates to a new and useful filter and consists of a sandvalve therefor which is provided with means for preventing breakage ofthe movable parts of the same.

It further consists of a new and useful means for supporting the topplate of the valve.

It further consists struction all as will forth.

Figure 1 represents a top plan view of a a sand valve embodying ourinvention with a portion of the top plate broken away. Fig. 2 representsa sectional view on line 9c0c, Fig. i. Fig. 3 represents a sideelevation of a portion of the device. Fig. 4 represents a side elevationshowing a form of protector or stop which may be employed. Fig. 5represents a top plan view of a sand valve of slightly differentconstruction, showing a portion broken away. Fig. 6 represents asectional view on line y-y, Fig. 5. Fig. 7 represents a side elevationthereof with a ortion broken away. Fig. 8 represents a sectional viewshowing a form in which the lower plate can be made.

Similar numerals of reference indicate correspondingparts in thefigures.

Referring to the drawings: We have found inpractice in sand valves nowemployed in filters of the form similar to that shown in Letters PatentNo. 707,333, that the wings, flaps or valves are apt to be broken awayor the top plate bent by reason of the alternate opening'and closing ofthe port in operation and the pressure of the water in its passagethrough the valve, and we have further found that by reason of theweight of the sand which is necessarlly superimposed upon of noveldetails of conbe hereinafter fully set Specification of Letters Patent.

the valve, as well as by the reaction of the ports or wings in operationof washing, that the top plate is in many instances concaved and inothers entirely broken down, thus rendering the sand valve incapable ofroper operation and in some instances entire y destroying the valve.

Our present invention is designed to overcome this defect and while wehave shown in Patented Jan. 21, 1908.

Serial No- 382.876-

the drawings a form for carrying out the same, it will be evident thatthe arrangement of the parts may be altered and other instrumentalitiesmay be employed, which will accomplish the same result and we do nottherefore, desire to be limited in every instance to the exactconstruction as herein shown and described.

In the drawings we have shown a construction of the valve proper similarto that shown in the Patent No. 7 07,333, patented August 19, 1902, itbeing understood that the sand valve in the present instance is designedand arranged to be used in the same manner as that shown in the saidpatent or in any other desired manner. I

1 designates a sand valve consisting of a body comprising respectivelyto and bottom plates 2 and 3 of any suitab e material and between theseplates is the side wall of said body, the same consisting of a ring orannulus 4 to which the plates 2 and 3 are suitably attached, in theresent instance by means of the screws 5. etween the plates and ring,preferably at the place where the same are secured together, are washers6 which hold the plates a slight distance away from the ring, formingspaces or ports between the same. In the plates are the cuts, slits orother suitable means, as at 7, which extend from the periphery towardsthe center in such a manner as to leave portions of the plates movable,said portions forming flaps or valves 8 which are ada ted to beautomatically raised and lowere as the water flows in either direction,it being noted that the screws 5 pass through the narrow portion of theplates between the slots or cuts 7 as best understood from Fig. 1.Carried by or held in place by screws 5 are the stops 9, the same beingwider than that portion of the plate which is engaged by the screws 5 sothat the said stops 9 project over the flaps or valves 8, that is tosay, the said stops project beyond the slits or cuts 7 and form anoverhang for the said valve 8, attention being called to the fact thatthe said stops 9 are so supported with respect to the said valves 8 asto be normally situated a slight distance above the same, this beingclearly seen in Figs. 2, 3 and 4. It will be seen from the above that asthe valves or flaps 8 are raised, the same can be moved only a distanceequal to that between the said valves and the stops 9, since the edgesof the plates will contact with the overhang of said stops and will pre*vent further upward movement. It will be seen that in thls way too greata strain is prevented upon the valves or flaps so that bending orbreaking of the same is prevented, since we have found, as beforestated, in practice that where there are no stops to revent the upwardmovement of the va ves that, owing to the inner ends of the cuts 7 beingsubstantially close, there is a bending and possible cracking of the.fla s or valves near the center as shown in dbtted lines,

' Fig. 1 at 15, which render the same useless.

In order to prevent the valves or flaps from being elevated too much, ata point between the slits 7, we provide the headed pins or screws 16,the heads of which are located at a suitable point above the normalposition of the valves or flaps 8 and allow only apredeterminedmovement.

In Fig. 3 we have shown the stop 9 in the form of a plate with aseparator or spacer 10 between it and the top plate 2, and in Fig. 4, wehave shown the stop and separator formed integral, the effect of whichis evident. Carried by the bottom plate 3 is the pipe or nipple 11 whichalso engages with the annulus or disk 12, the same being secured to thebottom plate 3 by the screws 13 and we have shown connected with thebottom plate by means of the screws 13, the pillars 14, the same beingin the present instance three in number and being situated at equaldistances around the center of the top plate 2, which is adapted to restthereon, it being seen that in this way 'we support the top plate 2 atsuitable distances, in order to prevent the same from being broken orbent in by reason of the weight of the sand which is superimposed uponthe said valve or by the reaction of the flaps when under pressure. Itwill be seen that while we have shown the pillars 14 in the form ofhollow tubes that the same can be made integral with the plate 3 ifdesired or in any suitable manner and that any desired number of thesepillars may be made to support the plates which maybe necessary.

It will be further apparent that the valves 8 may be formed in anydesired manner, shape, number or size, it being only neces sary to limitthe upward movement thereof.

.ln'the construction shown in Figs. 5 to 7, we provide the pins orscrews 16 to limit the movement of the flaps 8 and over the heads ofsaid pins we fasten the protector or cap18, which may be secured to thevalve or flap in any desired manner and moves therewith, said capserving to protect the screws and preventing the lodgment of sandbetween the head thereof and the valves. We further dispense with theslits 7 in the lower plate and place the packing 19 between the ring 4and the lower plate, thus making a joint therebetween and preventing ifthe ring and lower plate were made in one piece, which can be done ifdesired. This latter construction we have shown in Fig. 8 in which thebottom plate 3 is made with the integral rim 17 serving as the annulusor ring 4, and with the boss 20taking the place of the disk 12'. Inthisconstruction the pillars or supports 14 are tapped into the bottomplate 3 as far as may be necessary.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent, is

1. In a device of the character described, a body, movable valvesthereon, spacing devices between the top and bottom of said body and astop for said valves to limit the movement thereof.

2. In a device of the character described, a body'consisting of top andbottom plates, and a side wall, spacing devices between the top andbottom plates, movable valves formed in said top plate, and said valvesand limiting the movement thereof.

3. In adevice of the character described, a body consisting of top andbottom plates, spacing devices between the top and bottom plates, portstherebetween, a valve controlling said ports, and stops for limiting themovement of'said valve.

4. In a device of the character described, a

body'portion consisting of top and bottomplates, spacing devices betweenthe top and bottom plates and side walls, a portion of said top plateserving'as a movable valve, and a stop for said valved portion limitingthe movement thereof.

5. In a device of the character described, a body having a top plate,pillars for supporting the same a side wall, a port between said walland plate, said plate being movable-in part as a valve, and a stop forlimiting the upward movement of said valve.

6. In a device of body formed of a top plate, aside wall, a bottomplate, said plate being movable in part as a valve, and pillars carriedby said bottom plate and upon' which said upper plate is adapted torest.

7. In a device of body formed of top and bottom plates and side walls,movable valves on said top, a nipple connected with the bottom plate,and

stops projecting over the character described, a

the character described, a

means for separating the top and bottom

